Tube-expander



(No Model.) z'sneets-sneet 1. M; H. MGNAIR.

TUBE EXPANDER.

No. 392,280. Patented Nov. 6, 1888.

2 Sheets-Sheet 2.

(No Model.)

M. H. McNAIR.

TUBE EXPANDER.

. fluenfor,

UNITED STATES PATENT OFFICE.

MILTON H. MCNAIR, OF MEADVILLE, PENNSYLVANIA.

TUBE-EXPANDER.

SPECIFICATION forming part of Letters Patent N0. 392,280, dated November 6, 1888.

Application filed June 6, 1888.

which it appertains to make and use the same.

My invention relates to means for expandmg the ends of tubes or lines of boilers, and has for its object an improvement on the type of tube-expanders represented by the expired 5 5 patent granted to R. Dudgen,February 5, 1867,

The invention will be hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, which form part of this specification, Figure 1 represents a side View of my device, partly in section, as applied to a tube-sheet of a boiler. Fig. l" is a section on the line y y. Fig. 1" represents a longitudinal vertical section with the shaft,

mandrel, and pawl-carrier in side elevation.

Fig. 2 is a front end view with the rollertube removed. Fig. 3 is a cross-section showing the casing and bracket attached. Fig. t is a front end view of the feed-ring, as shown in Fig. 1, detached. Fig. 5 is a side view of the same. Fig. 6 shows a rear end view of the ring. Fig. 7 is an enlarged sectional detail showing the brake. Fig. 8 is a vertical section of a pawl-carrieruflFig. 9 is a side view 5 ,of'apawl and its shaft.

Reference being had to the drawings and the letters marked thereon, A represents the main sleeve, which is provided with a tubular projection, a, adapted to enter a tube or flue above 0 the one being operated upon, to support the front end of the expander, as shown in Fig. 1, and with projections b b b, which surround the latter tube and bear upon the surface of the tube-sheet to steady the device. This sleeve 5 is provided with an external screw-threaded portion, a, and is bored out at (l to receive the shaft 0 and mandrel f, and in its front end it supports a tubular sleeve, which supports the roller IL in the cavities i. Therollers are 0 preferably made conical, as shown in Figs. 1

and 1, and applied to the sleeve 9 with their largest ends forward, whereby they expand 1 the tube on the inner side of the tube-sheet X,

Serial No. 276,193. (No model.)

as shown at 2 in Fig. 1. They may, however, be made in form of the Dudgen roller,as shown in Fig. 1".

On the rear end of the sleeve 7 is a nut, In, which is provided with a left-hand screwthread,and is inserted in a slot, Z, in the main sleeve A, and serves to hold the sleeve g against longitudinal displacement, while it is free to revolve in the main sleeve. The rollers are secured in their cavities i by a cap, m, while they are free to revolve and move laterally.

The shaft e and the mandrel f are secured together by screw-threads, as shown at a, and are held against unscrewing by a pin, 0, which passes diametrically through both of them.

B indicates another sleeve,which is provided at its front end with an internal screw-thread, 1), which engages with the thread 0 on the sleeve A, and feeds the mandrel f through the sleeve A, for expanding and swaging a tube,through the instrumentality of the roller it. On the rear end of the sleeve Bis aratchetwheel, q, and immediately in front thereof and adjacent to it is a ring, 1', the purpose and construction of which will hereinafter more fully appear.

0 is a casing which is bored out to receive the front end of the sleeve B, fits around and is secured to the sleeve A by a screw, s, and protects the thread 0 on the sleeve A. To the casing Cis secured a bracket, '6, through which the brace-rod it passes, and it also supports a gage-rod,v,which is adjustably secured therei u by a thumb-screw, w. The gage-rod is bent downward at its rear end at a and registers with grooves b on the sleeve B, to indicate the extent to which the tapering mandrel f has been fed into the sleeves A and g to distend the rollers h. The rear end of the brace-rod a is detachably secured to the ring 9" by screws 0 c, for the purpose of preventing said ring from revolving when the expander is operated by power applied to the shaft e.

D indicates a head or pawl-carrier,which is secured to the shaft 6 by means of a screw, (1, and is provided withadouble-ended pawl, e, which is supported upon a shaft, f, which passes through the head D and is secured thereto by a nut, g.

The shaftf is provided with two angular surfaces, It It. with which corresponding angular faces, 2" i, of a plug, 7c, engage to throw one or the other end of the pawl 6 into working engagement; with the ratchet-wheel g. In the head D is a recess, Z, at right angles to the shaftf, and contains the plug kand a spring, at, which is operated upon by a screw, a, to regulate the pressure upon the plug it for antomatically engaging the angular faces 1" of said plug with the angular surfaces h on the shaftf of the pawl 0. The end 0 of the pawl e engages with the ratchet-wheel q for intermittently feeding the mandrel into the sleeves, and is held out of engagement with the wheel by the projection 1), bearing upon the periphery of the ring 1' until the groove q (shown in Figs. 5 and 6) is reached, when the tension of the Spring m will cause that end of the pawl to engage with the wheel 1 and revolve the sleeve B until the end of the groove has been rcaehed,when the projection p willagain engage with the periphery of the ring r until another revolution of the shaft 6 and the head or pawlcarrier D have been made.

it will be observed that the head D is secured to and revolves with the shaft 0, and by means of the pawl and ratchet-wheel described gradually and intermittently feeds the sleeve B and the mandrel f forward to expand and swage a tube. Upon the shaft 0 is a collar, 7', which bears against the inner surface of the wheel q, while the head I), secured to the shaft, bears against the outer surface of said wheel and prevents any longitudinal movement of. the shaft independent of the sleeve l to which it is attached.

In backing the mandrel out, after a tube has been properly expanded the end s of the pawl c is put into engagement with the ratchetwhcel and is held in operative contact therewith throughout the entire reversed revolu tions of the shaft e and the head D, thus withdrawing the mandrel at a much greater rate of speed than that at which it was fed forward. The backing operation is effected byinserting a rod, 3, in the hole t in the head D and re volving it and the shaft 0 in the reverse direction from that by which it was fed into the tube.

The ring r forms an important factor in my invention, and will now be more fully described.

Viewed from the position in which it is shown in Fig. 1, the front end is provided with ratchet-teeth a and a recess, a, as shown in Figs. 1, 4, and 5, and a brake consisting of a hollow screw, or, a spring, m, and a shoe, 7 which enters a groove, 1:, in the sleeve.

The ring 1" is prevented from slipping on the sleeve B, while the ratchet is being turned back to take a new bite in the wheel q, and riding upon the teeth aof said ring, by a brake composed of a hollow screw, 10, which engages with the ring 1' and compresses a spring, 2;, against a shoe or plug, y, which operates in a groove, 2, of the sleeve B, as shown in Fig. 7.

Having thus fully described my invention, what I claim is- 1. A tube-expander provided with a fixed sleeve having projections, as a b, a revoluble sleeve supporting rollers, and a movable sleeve attached to said fixed sleeve by a threaded connection, in combination with a mandrel and suitable means for revolving the mandrel and moving it longitudinally, substantially as described.

2. Atube-expander provided with a fixed sleeve, as A, a revoluble sleeve, as 9, supporting rollers,a shaft and mandrel passing through said sleeves and united by screw-threads, and a transverse pin, as at a 0, in combination with a movable sleeve, as B, supporting a ratchetwheel, and a pawl-carrier, substantially as described.

3. A tube-expander provided with a fixed sleeve, as A, a movable sleeve, as B, connected by screw-threads, as c p, a revoluble sleeve, as g, supporting rollers, and a mandrel and operating mcchanisnnin combination with a casing, as C, secured to the fixed sleeve and inclosing the portion 0 thereof and part of the movable sleeve B, substantially as described.

t. A tube-expander provided with a fixed sleeve, rollers mounted in a revoluble sleeve, a mandrel, and operating mechanism, substantially as described, in combination with a movable graduated sleeve, and a gage-rod supported by the fixed sleeves, as and for the purpose set forth.

5. A tube-expander provided with a movable sleeve, a detachable and reversible ring, as 1", having ratchet-teeth a, groove and recess a, supported by said sleeve, in combination with a pawl-carrier secured to the shaft of the mandrel, substantially as described.

6. A tube-expander provided with a fixed sleeve, as A, a movable sleeve, as B, for re ciprocating a mandrel and rollers, a ratchetwheel, amt a pawlcarricr, in combination with a ring having ratchet-teeth and supported by the movable sleeve, andabrace-rod secured to said ring and the fixed sleeve, substantially as described.

7. A tube-expander having a pulley secured to the mandrel, in combination with a head, as D, provided with a pawl and secured to said mandrel, a ratclietwlieel, as q, secured to a revoluble and reciprocating sleeve, as B, and a ring, as 0, having a groove, as q, also secured to said sleeve, substantially as described.

S. A tube-expander provided with rollers, a mandrel, a fixed sleeve, as A, a movable sleeve, as B, and a ring supported by the sleeve B, and having ratchet-teeth and a brake, in combination with ratchets and pawls, substantially as described.

In testimony whereof Iaftix my signaturein presence of two witnesses.

MILTON II. MCNAIB. lVitnesses:

S. B. ADAMS, JOHN U RICK.

ICC 

